My St Augustine has been invaded with rhizoctonia which is called Large Patch or Root Rot in St Augustine and Zoysia and is called Brown Patch when it hits cool season grasses like turf type tall fescue.
Scott's DiseaseEx cheaper on Amazon than at the store, who knew?
https://amzn.to/2YrloC2
More on disease prevention:
https://thelawncarenut.com/blogs/news/how-to-prevent-lawn-fungus-disease
Website - Lawn Plans:
https://thelawncarenut.com/collections/digital
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